I can not open the link for my grid view

I made the following code

<asp:GridView ID="GridView1" runat="server" AllowPaging="True" AutoGenerateColumns="False" DataKeyNames="ID_PTD" DataSourceID="SqlDataSource1" EmptyDataText="There are no data records to display.">
        <Columns>
            <asp:BoundField DataField="CAMINHO" HeaderText="CAMINHO" SortExpression="CAMINHO" />
            <asp:BoundField DataField="NOME" HeaderText="NOME" SortExpression="NOME" />
            <asp:BoundField DataField="PROFESSOR" HeaderText="PROFESSOR" SortExpression="PROFESSOR" />
            <asp:BoundField DataField="ETEC" HeaderText="ETEC" SortExpression="ETEC" />
            <asp:BoundField DataField="DATA" HeaderText="DATA" SortExpression="DATA" />
            <asp:TemplateField HeaderText="Documentos">
            <EditItemTemplate>
                        <a ID="hpCaminho" class="materialize-textarea"  href ='<%# Bind("CAMINHO") %>' runat="server">Abrir</a>
                    </EditItemTemplate>
                    <ItemTemplate>
                        <a ID="hpCaminho" class="materialize-textarea"  href ='<%# Bind("CAMINHO") %>' runat="server">Abrir</a>
                    </ItemTemplate>  
            </asp:TemplateField>
        </Columns>
    </asp:GridView>

It runs without errors in my visual studio, however, clicking the link in the grid view does not happen

We can see that in the lower left corner it shows the path, but when I click open it does not open, why it does not open and how can I resolve it